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How to Solve Longest Unequal Adjacent Groups Subsequence II Problem
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Start Free for WindowsMedium#2901
LeetCode ProblemLongest Unequal Adjacent Groups Subsequence II
You are given a string array words, and an array groups, both arrays having length n. The hamming distance between two strings of equal length is the number of positions at which the corresponding characters are different. You need to select the longest subsequence from an array of indices [0, 1, ..., n - 1], such that for the subsequence denoted as [i0, i1, ..., ik-1] having length k, the following holds: Return a string array containing the words corresponding to the indices (in order) in the selected subsequence. If there are multiple answers, return any of them. Note: strings in words may be unequal in length.
ArrayStringDynamic Programming
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Problem Breakdown
Understanding the Longest Unequal Adjacent Groups Subsequence II Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given a string array words, and an array groups, both arrays having length n. The hamming distance between two strings of equal length is the number of positions at which the corresponding characters are different. You need to select the longest subsequence from an array of indices [0, 1, ..., n - 1], such that for the subsequence denoted as [i0, i1, ..., ik-1] having length k, the following holds: Return a string array containing the words corresponding to the indices (in order) in the selected subsequence. If there are multiple answers, return any of them. Note: strings in words may be unequal in length.
MediumProblem #2901
LeetCodeLongest Unequal Adjacent Groups Subsequence II
Related Topics
ArrayStringDynamic Programming
How Phantom Code Helps
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Examples
# Example 1
Input
words = ["bab","dab","cab"], groups = [1,2,2]
Output
["bab","cab"]
# Example 2
Input
words = ["a","b","c","d"], groups = [1,2,3,4]
Output
["a","b","c","d"]
Constraints
1 <= n == words.length == groups.length <= 1000
1 <= words[i].length <= 10
1 <= groups[i] <= n
words consists of distinct strings.
words[i] consists of lowercase English letters.
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Solve Longest Unequal Adjacent Groups Subsequence II — You are given a string array words, and an array groups, both arrays having leng...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Longest Unequal Adjacent Groups Subsequence II and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Longest Unequal Adjacent Groups Subsequence II during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Longest Unequal Adjacent Groups Subsequence II?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
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Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Longest Unequal Adjacent Groups Subsequence II type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Longest Unequal Adjacent Groups Subsequence II interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Longest Unequal Adjacent Groups Subsequence II during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Longest Unequal Adjacent Groups Subsequence II style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Longest Unequal Adjacent Groups Subsequence II interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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